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Using the pump
Fault
6. The pump runs, but gives
no water.
7. The pump runs backwards
when switched off.
8. The pump runs with
reduced performance.
30
English
Cause
a) Pump inlet pressure too low.
b) The suction pipe is partly
clogged by impurities.
c) The foot or non-return valve is
stuck in its closed position.
d) Leakage in suction pipe.
e) Air in suction pipe or pump.
a) Leakage in suction pipe.
b) Foot or non-return valve
defective.
c) The foot valve is stuck in
completely or partly open
position.
a) Wrong direction of rotation.
b) See 5. a), b), c), d).
Remedy
See 5. a).
See 5. b).
Remove and clean, repair or replace the valve.
See 5. c).
See 5. d).
See 5. c).
See 6. c).
See 6. c).
Switch off the power supply with the external
circuit breaker, and interchange two phases
in the pump terminal box. See Checking the
direction of rotation on page 27.
HIGH VOLTAGE
DIRECTION OF ROTATION
W2
U2
U1
V1
V2
W1
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